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Hm, could be several things. If stitches are not being formed, it could be a timing issue (the needle does not arrive at the bobbin at the correct time). Did the machine recently hit a pin or something hard? That will knock a machine out of time. There could also be a broken piece stuck that is preventing the feed dogs from operating. Thoroughly clean the machine around the bobbin area and feed dogs.
It sounds like you the thread is passing a place with a burr, it could be in the needle (replace needle) or on the stitchplate (maybe a bent needle hit the stitch plate and put a knick in it, a sewing repair man can sand it out). Or you don't have the tension right. Or you may have cheap thread that is not strong enough. I hope some of these suggestions are helpful.
Knowing which kind of machine you have helps alot. Just guessing but maybe the reverse mechanism is stuck and needs some oil in it to free it up. Or the buttonhole mechanism is stuck in reverse part of it.
Probably you should have it looked at.